From the information provided in the picture, we can see that cars greatly facilitate our travel and improve the quality of life; The exhaust gas from cars has seriously polluted the air. Therefore, cars greatly facilitate our travel and improve the quality of life; The exhaust gas from cars has seriously polluted the air.

There are a lot of pollutants after gasoline combustion, so it is necessary to change the combustion mode of the engine to make the fuel burn fully, or use a purification device to turn harmful gas into harmless gas. Suggestions are as follows: (1) improve the combustion mode of the engine to make gasoline burn fully; Use a purification device to convert harmful gas into harmless gas.